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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en">
<head>
	<meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
	<title>Document</title>

	<style>

		.sec_box_class{
			width: 1190px;
			height: 515px;
			margin:0 auto;
		}

		#sec_box_1{
			background:red;
		}

		#sec_box_1 #sb_1_left{
			width: 190px;
			height: 515px;
			background:#2C9881;
			float: left;
		}
		#sec_box_1 #sb_1_center{
			width: 510px;
			height: 515px;
			background:#7C982C;
			float: left;
			margin-left: 10px;
			margin-right:10px;
		}
		#sec_box_1 #sb_1_right{
			width: 470px;
			height: 515px;
			background:#D80AF2;
			float: left;
		}

		#sec_box_2{
			background:orange;
		}
		#sec_box_3{
			background:yellow;
		}
		#sec_box_4{
			background:green;
		}
		#sec_box_5{
			background:blue;
		}
		#sec_box_6{
			background:purple;
		}
	</style>
</head>
<body>
	<header>
		网页头部
	</header>
	<section id = "sec_box_1" class = "sec_box_class">
		<div id="sb_1_left">1</div>
		<div id="sb_1_center">2</div>
		<div id="sb_1_right">3</div>

	</section>
	<section id = "sec_box_2" class = "sec_box_class">
		（区块2）
	</section>
	<section id = "sec_box_3" class = "sec_box_class">
		（区块3）
	</section>
	<section id = "sec_box_4" class = "sec_box_class">
		（区块4）
	</section>
	<section id = "sec_box_5" class = "sec_box_class">
		（区块5）
	</section>
	<section id = "sec_box_6" class = "sec_box_class">
		（区块6）
	</section>	
	<footer>
		网页尾部
	</footer>
</body>
</html>